In here, I have to say, those who public information in Making Friends are trully looking for someone with English as mother language to help them improve English skill. I am wondering who is so stupid to be willing to teach you something for free. Shouldn't those people feel ashamed when doing so?

I have often been approached on the street by Chinese people who want my phone number and 'be my friend ', but I know all they want is free English lessons.
No, i am not a free English teacher, but some people are kind hearted and allow their free time to be used for this, but my free time is for rest, class preparation - my use.
I have been shouted at and abused verbally by people who call me selfish for not giving up my free time for nothing.

I would suggest that Chinese people who want to learn English actually pay for classes and not look at foreigners as a cheap source of learning or as someone to be exploited.
It is such Chinese who should be ashamed .
No, you are not being 'clever'